UFC officials on Tuesday announced the fight, which Roller previously had mentioned on his Twitter feed.

UFC 151 takes place Sept. 1 at Mandalay Bay Events Center in Las Vegas. The event’s main card airs live on pay-per-view. FX and Facebook are expected to carry preliminary-card fights. The main event is a light heavyweight title fight between champion Jon Jones and former Strikeforce champion Dan Henderson.

The Volkmann-Roller bout’s placement on the card is not yet known.

Roller less than three weeks ago snapped a three-fight skid when he outpointed John Alessio at UFC 148 in Las Vegas. That win snapped a slump that saw him drop fights to Melvin Guillard (knockout), T.J. Grant (submission) and Michael Johnson (decision). But a change in camp to get him closer to home, he said before the fight, had him in a better state of mind than he was in during the losing streak.

Before coming to the UFC, Roller was a standout in the WEC, going 6-2 in that promotion – with his only losses coming to eventual champs Benson Henderson and Anthony Pettis.

Volkmann in May had a five-fight win streak snapped when he was submitted by Paul Sass just 1:54 into their fight at UFC 146. Prior to that, Volkmann had built up a streak of five decisions over names including Danny Castillo and Efrain Escudero. Those five wins had put the memory of two losses to open his UFC career well in the rearview mirror.

As the UFC 189 tour made its last stop in Dublin, featherweight champ Jose Aldo was met with a torrent of abuse from the Irish fans. It might have been unpleasant, but it might also have been just what he needed.